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out a remote sensor, only the internal sensor signal is used. The value measured by
the remote sensor is displayed on the service level. The connection of a remote sensor
is recommended when:
The room unit is not installed in the reference room
The room unit is exposed to a heat source that produces heat gains
Using a potential-free contact, various functions can be controlled from a remote loca-
tion. These functions are only active in automatic and manual operation. Standby mode
does not permit any remote control functions. The parameters of the contact must be
set on the service level (N.O. or N.C. contact) using 1 of 3 functions:
Functions 2…
4: Poten-
tial-free contact for
different functions
Function 2: When receiving a signal from a modem contact or window switch, the
temperature setpoint will be permanently set to the reduced level; function 2 is rec-
ommended for airing detection via a window switch
Function 3: When receiving a signal from a modem contact or window switch,
changeover to standby mode occurs
Function 4: Alarm transmission to the OZW30 central unit; the signals received from
alarm systems, gas or pressure monitors is passed on to the central unit
Note
If 1 of the functions 2 to 4 is activated by the contact, the LCD only displays the letter E
(ex
ternal) and the active function. All other displays will disappear.
Type summary
Room unit QAW20
Remote sensor QAW44
Ordering
When ordering, please give type reference according to “Type summary”.
If the Operating Instructions need to be in a language other than the country-specific
language, it is necessary to also state the reference number of the instructions accord-
ing to the following list (other languages on request):
Language Reference number
Danish 4 319 2737 0
Dutch 4 319 2514 0
English 4 319 2285 0
French 4 319 2283 0
German 4 319 2282 0
Hungarian 4 319 0052 0
Italian 4 319 2284 0
Swedish 4 319 2767 0
Mechanical design
The room unit consists of terminal base and operating section. The base can be fitted
to most commercially available conduit boxes or directly on the wall before the operat-
ing section is placed on it. Both housing and terminal base are made of plastic.
Disposal
The larger plastic parts carry material reference markings conforming to ISO/DIS11469
to facilitate environment-friendly disposal.
Engineering notes
Room
unit
The room unit should be mounted in the main living room (reference room). It acquires
the room temperature, which is used for temperature control.
5/8
Siemens Room unit QAW20 CE1N2812en
Building Technologies 13.08.2010
5


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